Harrow-tooth



G. G. WINSLOW.

' Harrow-Tooth.

Patented April 27,1880.

INVENTOR WITNESSES: 2a MM ATTORNEYS.

NLPETEIS, Pl-lmumoGRAPHER, WASHINGTON D C FNiTEn STATES PATENT Orrica.

HARROW-TOOTH.

SPECIFICATION forming part of Letters Patent No. 227,085, dated April27, 1880. Application filed February 21, 1880.

To all whom it may concern Be it known that I, GEORGE G. WINSLOW, ofKalamazoo, county of Kalamazoo, and State of Michigan, have invented anew and Improved Harrow-Tooth; and I do hereby declare that thefollowing is a full, clear, and exact description of the same, referencebeing had to the accompanying drawings, forming part of thisspecification, in which- Figure l is a side view of the tooth applied tothe barrow-bar, and showing, in dotted lines, the position of the springin yielding. Fig. 2 is a horizontal section through line 00 as of Fig.1.

My invention relates to an improvement in spring harrow teeth; and itconsists generally in hinging the barrow-tooth in the forward end of arectangular frame bolted to the harrowbar, and combining therewith aspring, which at its back end is clamped to the harrow-bar by the samebolts which secure the rectangular frame, and which spring then curvesupward and forward, and then down through the slot or opening of therectangular frame, and is jointed at its extremity, near the bottom ofthe harrow-tooth, so that its tension serves to throw the barrow-toothforward, but allows it to yield to obstruction.

The invention also consists in the combination of the reversibleharrow-tooth with its back plate, the rectangular frame, and the spring,as hereinafter more fully described.

In the drawings, A represents one of the bars of the barrow-frame orcultivator. B is the reversible tooth, sharpened at both ends. 0 is thespring, D, the rectangular frame, and E the back plate, of theharrow-tooth.

The tooth B is ordinarily made about eight inches long, two inches wide,and three-sixteenths of an inch thick, and is bolted at top and bottomto the back plate by bolts to a. This back plate may be either forged ormade of malleable cast-iron. and its side bars stand in a plane at rightangles to the plane of the tooth, and are formed with open half-roundseats I), which, when the back plate is bolted tothe tooth, are closedin and retain, respectively, the end of the rectangular frame and thelower end of the spring.

The rectangular frame D is bolted at its rear end to the barrow-bar bybolts 0 c, and beneath the broad portion of said rectangular I frame isclamped the rear end of the spring 0. The front cross-bar of therectangular frame is retained in the upper one of the seats I) of theback plate, and constitutes a fulcrum upon which the tooth turns inyielding to obstrucback plate receives the bolt 0, that secures thefront end of the spring. This spring rises from its point of connectionwith the back plate of the tooth, and passes upward and slightly to therear, and after passing through the slot or opening of the rectangularframe inclines to the front again until it coincides with the curve ofthe tooth, after which it bends over, down, and under the rear end ofthe rectangular frame.

The principal advantages of this improved construction are as follows:

First, by extending the spring through the rectangular frame andjointing it to the lower part of the tooth the side bars of the saidrectangular frame form a guard or guide against the lateral displacementof the spring when the tooth is being deflected.

Secondly, by causing the tooth to fulcrum near its upper end andapplying the tension of the curved spring low down and near the groundthe tension of the spring is utilized to great advantage, while theupper end of the tooth or its back plate is made to act as a stop whenthe tooth resumes its normal position after being deflected.

Thirdly, the peculiar form of the back plate with its seats b not onlypermits the reversal of the tooth or gives an adjustment as to leverageby permitting the fulcrum to be placed in one or the other of the seats,but it forms also a ready and efficient means for connecting the partstogether.

In defining the limits of this, my present invention, I would state thatin another application for a spring barrow-tooth, which I tiled November29, 1879, I have made broader claims than in the present case, and Itherefore do not claim in this case any subject-matter which is shown orclaimed in the said prior case.

Having thus described my invention, what I claim as new is- 1. In aspring barrow-tooth, the combination, with a rectangular open framefixed to tions, while the lower one of the seats b in the thebarrow-bar, of a barrow-tooth fulerulned upon the rectangular frame, anda spring connected with the barrow-bar and extending over and downthrough the rectangular frame and jointed to the tooth below itsfulcrum, as described.

2. The back plate, E, having open seats I), combined with the spring andrectangular frame, and bolted to the tooth so as to inclose theconnections of said spring and frame, sub- 10 stantially as described,and for the purpose set forth.

GEORGE O. WINSLOW.

Witnesses:

FRANK E. KNAPPEN, EDWIN O. CLIFFORD.

